Pressure gun with air release and filler



April 6, 1955 0. e. WORDEN 3,176,886

PRESSURE GUN WITH AIR RELEASE AND FILLER Filed Feb. 27, 1963 FIG. L

INVENTOR. DONALD G. WORDEN BY c/lndrus i sidrlfe Attorneys United States Patent 3,176,886 PRESSURE GUN WITH AIR RELEASE AND FILLER Donald G. Wordeny302 E. Main St.,-Plattevillc, Wis. Filed Feb.- 27, 1%3, Ser. No. 261,296 4 Claims. ((11. 222387) This invention relates to a pressure gun with air release and filler, and more particularly to an improved gun for lubricating, calkingand the like.

Grease guns often tend to accumulate air'at the discharge end'of the grease-holding chamber. When the gunis-operated, air instead of grease will be discharged through the nozzle so that the lubricating function is interfered with. I

The present invention solves the above-mentioned problemand provides a pressure gun with means-apart from the nozzle-for discharging such unwanted air, and also for providing filling of the gun through the air discharge chamber.

The accompanying drawing illustrates the best mode presently contemplated by the inventor for carrying out the invention.

In the drawing:

FIGURE l is a longitudinal central section of a pressure gun, showing the air discharge and material filling means;

FIG. 2 is a right end elevation of the gun; and

FIG. 3 is-an enlarged transverse section taken on line 33'of FIGURE 1.

As shown in the drawings, the invention is directed to a pressure gun comprising a generally elongated closed housing 1 of cylindrical or other suitable section having a piston 2 disposed in its inner chamber. A piston rod 3 extends through one end of housing 1 and connects the piston with a handle 4.

The chamber is adapted to contain and store material, such as lubricating grease 5. Upon manual operation of handle 4 and sliding of piston 2, the grease is forced through an opening 6 disposed centrally of the discharge end of housing 1 and hence through a suitable conduit or hose 7 to the grease dispensing restrictive nozzle 8.

The details of gun construction described above are generally only illustrative, and numerous other wellknown grease discharging pistons and the like may be utilized without departing from the spirit of the invention.

In operating the pressure gun, an air pocket 9 may develop adjacent the discharge end, so that air instead of grease passes through hose 7. This is undesirable. The invention therefore contemplates means for discharging the unwanted air so that it will not pass through the hose.

For this purpose, a valve 10 is mounted in the extreme discharge end of housing 1 and is spaced transversely and radially from opening 6. Valve 10 comprises a longitudinally extending tubular housing 11 which is attached to gun housing 1, as by threads 12. Valve housing 11 forms an elongated enclosed chamber 13 normally communicating only with the gun chamber and air pocket 9.

As shown the side wall of housing 11 is provided with an opening communicating with chamber 13 and forming a valve seat 14 adapted to sealingly receive a complementary valve closure member 15. Member 15 is secured to one end of a transverse plunger rod 16 which extends through the central portion of housing 11 and chamber 13. The other external end of rod 16 is provided with an enlarged end button 17, and a spring 18 encircles the rod between button 17 and the valve housing. Spring 18 thus biases member 15 to a normally closed position.

If no air pocket 9 exists, application of pressure on grease 5 will cause it to move through hose 7 and nozzle 8. Valve 10 is closed to prevent passage of grease therethrough. However, if an air pocket 9 is present and the 'templated' as beir'igwithin the scope of the following mined visually when g'rease begins discharging from the valve openingl"Button 17 i'sthen released. V

"When'the air pockef'cor'nmunicates withb'oth opening 6 and-chamber 13,115 is often the case, the entrapped air will pass through valve 10 and not tend to pass into hose 7, since th'e' frictional resistance of the valve walls and opening is less than that'of hose 7 and/or restrictive nozzle 8. When the air discharge valve is closed,"spring 18 is stronger than the grease discharge pressure.

As shown, chamber '13 functions'not only for air discharge but also for introduction of grease intothe gun. For this purpose, a one-way valve, such "as a Zerk or grease fitting 19 is securedto opening in the outer end of housing- 11. For filling the gun, a source of grease is connectedto fitting l9 and grease is pumped under pressure inw'ardlydhrough chamber 13' and into the gun chamber; This is accomplished with valve closure mem ber 15 seated. Fitting 19 is constructed so that it is normally closed and blocks outward passage of air but only permits inward passage of grease. i

The invention provides a simple and reliable means for releasing air entrapped in the discharge end of apressure gun. This ineans,whichiss'paced from the primary gun discharge o'peningalso functions as a gun filler means.

Various modes of carrying out the invention areconclaim's particularly pointingout and'd-istinctly claiming the subject matter which is regarded as the invention.

1 claim:

1. An improved pressure gun, comprising:

(a) an enclosed gun housing forming a chamber for storage of material therein,

(b) said housing having an opening in its discharge end for dispensing the material from the chamber,

(0) pressure applying means disposed at the other end of said housing for applying a force on the material so that it will pass outwardly through said opening,

(d) valve means disposed in the discharge end of said housing,

(e) means to bias said valve means to a normally closed position,

(7) said valve means being manually openable against said biasing means for permitting air entrapped in the discharge end of said housing chamber to be released therethrough when said pressure applying means is in operation,

(g) said valve means including a valve seat and a valve closure member together with a valve chamber through which the entrapped air passes in an outwardly direction,

(h) and filler means comprising a one-way valve connected to said valve chamber and normally closed but openable upon application of external pressure for permitting inward passage of said material through the said valve chamber and into said housing chamber to fill the gun,

(i) said valve means and said filler means being positioned so that material entering said filler means will pass through said valve chamber into said housing chamber when said valve means is in normally closed seated position.

2. An improved pressure gun, comprising:

(a) an enclosed gun housing forming a gun chamber for storage of material therein,

([2) said housing having an opening in its discharge end,

(c) restrictive material dispensing means connected to 'said opening,

(d) pressure applying means disposed at the other end of said housing for applying a force on the material so that it will pass outwardly through said opening and said dispensing means,

(e) a longitudinally extending tubular valve housing secured to the discharge end of said gun housing and disposed transversely of said opening,

( said valve housing forming a valve chamber communicating with the gun housing chamber,

(g) said valve housing having an opening in its outer tubular wall communicating with said valve chamber, I

(h) a valve seat disposed in said last-named opening,

'(i) a valve closure member adapted to sealingly engage said seat,

(j) a plunger connected at one end to said closure member and extending transversely through said valve housing and valve chamber, t

(k) spring means normally biasing said plunger and said closure member to a closed position,

- (I) said plunger being manually operable to open said closure member to thereby permit outward escape,

through said valve chamber of air entrapped in said gun chamber when said pressure applying means is in operation,

(m) and a one-way valve secured to the outer end of said valve housing and normally'closed but openable upon external pressure being applied thereto so that the material may be introduced inwardly through said valve chamber and into said gun chamber.

3. The gun of claim 2 in which the frictional resistance of said restrictive dispensing means to outward flow is greater than the frictional resistance of the valve mechanism of (e) through (I) so that air in a pocket communicating between said housing opening: and said valve 3,17e,eee

chamber will tend to pass outwardly through said valve mechanism rather than through said dispensing means when the said closure member is unseated.

4. For connection to the discharge end of a pressure gun, mechanism comprising:

(a) a longitudinally extending tubular valve housing forming a valve chamber and with said housing having a tubular wall and an end wall,

(b) said valve housing having an opening in its outer tubular wall,

(c) a valve seat disposed in said opening,

(0.) a valve closure member adapted to sealingly engage said seat, 7 V

(e) a manually operable plunger connected at one end to said closure member and extending transversely through said valve housing and valve chamber,

, (f) spring means normally biasing said plunger and said closure member to a normally closed position,

(g) and a one-way valve secured to the outer end wall of said valve housing and normally closed but openable upon external pressure being applied thereto,

(h) said valve closure member and said one-way valve being positioned so that material entering said oneway valve when the latter is open will pass through said valve chamber when said valve closure member is in its normally closed seated position.

References Cited by the Examiner UNITED STATES PATENTS 1,711,267 4/29 Hutt 251322 1,723,437 8/29 Owens 222-387 X 1,918,049 7/33 Maske 222-387 X 2,533,726 12/50 Floyd 222-397 X LOUIS J. DEMBO, Primary Examiner,

RAPHAEL M. LUPO, Examiner. 

1. AN IMPROVED PRESSURE GUN, COMPRISING: (A) AN ENCLOSED GUN HOUSING FORMING A CHAMBER FOR STORAGE OF MATERIAL THEREIN, (B) SAID HOUSING HAVING AN OPENING IN ITS DISCHARGE END FOR DISPENDING THE MATERIAL FROM THE CHAMBER, (C) PRESSURE APPLYING MEANS DISPOSED AT THE OTHER END OF SAID HOUSING FOR APPLYING A FORCE ON THE MATERIAL SO THAT IT WILL PASS OUTWARDLY THROUGH SAID OPENING, (D) VALVE MEANS DISPOSED IN THE DISCHARGE END OF SAID HOUSING, (E) MEANS TO BIAS SAID VALVE MEANS TO A NORMALLY CLOSED POSITION, (F) SAID VALVE MEANS BEING MANUALLY OPENABLE AGAINST SAID BIASING MEANS FOR PERMITTING AIR ENTRAPPED IN THE DISCHARGE END OF SAID HOUSING CHAMBER TO BE RELEASED THERETHROUGH WHEN SAID PRESSURE APPLYING MEANS IS IN OPERATION, (G) SAID VALVE MEANS INCLUDING A VALVE SEAT AND A VALVE CLOSURE MEMBER TOGETHER WITH A VAVLE CHAMBER THROUGH WHICH THE ENTRAPPED AIR PASSES IN AN OUTWARDLY DIRECTION, (H) AND FILLER MEANS COMPRISING A ONE-WAY VALVE CONNECTED TO SAID VALVE CHAMBER AND NORMALLY CLOSED BUT OPENABLE UPON APPLICATION OF EXTERNAL PRESSURE FOR PERMITTING INWARD PASSAGE OF SAID MATERIAL THROUGH THE SAID VALVE CHAMBER AND INTO SAID HOUSING CHAMBER TO FILL THE GUN, (I) SAID VALVE MEANS AND SAID FILTER MEANS BEING POSITIONED SO THAT MATERIAL ENTERING SAID FILLER MEANS WILL PASS THROUGH SAID VALVE CHAMBER INTO SAID HOUSING CHAMBER WHEN SAID VALVE MEANS IS IN NORMALLY CLOSED SEATED POSITION. 